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10 grams of AlCl3 contains a certain number of moles in particles.

1 mole of AlCl3 weighs (26.9815386+(3*35.453)=133.3405386), let's round that to 133.3405 grams.

So 10 grams = 10/133.3405 = 0.075 mole of AlCl3 (rounded), but for each AlCl3 we have, you get 4 ions (1 Al3+, 3Cl-). So we have 0.075 moles, but we get 4 times as many ions. 0.075*4=0.3 mole

1 mole = 6.022141x1023 (Avogadro's Number)

0.3 mole = 1.81x1023 ions

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